If the risk of discovery and the amount of the possible gain are great, then more time and thought must be spent on planning, disguising, surprising, escaping, and possibly covering up the crime. Fortunately for police authorities, criminals tend to act in haste. Their plans often go awry. They do not anticipate everything that can happen. They usually add to their arsenal of defenses rationalizations for their misconduct, or alibis. "It wasn't me: I was elsewhere." "The devil made me do it" "I am poor and misunderstood, a victim of oppression." "He had it coming" "I must have been crazy for doing what I did